A Ray of Sunlight

An alien boy from the planet Sora, Haruto dies after a monster attack but is luckily revived and lives temporarily on Earth for recovery. On Earth, he meets Katsunori, a stalker, delusional guy, person who wants to blow up his home planet and his father's former friend (or is there something more to the story?). During the length of this story, Haruto will meet many people who will keep reminding him what his name means in difficult times, a ray of sunlight.